<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        window.onload = function() {
            var box = document.querySelector('.box');
            console.log(box);
        }
    </script>
</head>

<body>
    <div class="box">你好</div>
</body>
<script>
    console.log(location.href);
</script>

</html>